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48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
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/*
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* Copyright 2012 The LibYuv Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "libyuv/mjpeg_decoder.h"
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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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// Helper function to validate the jpeg appears intact.
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// TODO(fbarchard): Optimize case where SOI is found but EOI is not.
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LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size) {
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size_t i;
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if (sample_size < 64) {
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// ERROR: Invalid jpeg size: sample_size
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return LIBYUV_FALSE;
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}
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if (sample[0] != 0xff || sample[1] != 0xd8) { // Start Of Image
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// ERROR: Invalid jpeg initial start code
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return LIBYUV_FALSE;
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}
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for (i = sample_size - 2; i > 1;) {
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if (sample[i] != 0xd9) {
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if (sample[i] == 0xff && sample[i + 1] == 0xd9) { // End Of Image
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return LIBYUV_TRUE; // Success: Valid jpeg.
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}
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--i;
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}
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--i;
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}
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// ERROR: Invalid jpeg end code not found. Size sample_size
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return LIBYUV_FALSE;
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}
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#ifdef __cplusplus
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} // extern "C"
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} // namespace libyuv
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#endif
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